Product Name: Triacetoxyethylsilane
Chemical Formula: C10H18O6Si
CAS Number: 17689-77-9
Synonyms: Ethyltriacetoxysilane, Silicic acid, ethyltriacetoxy-, triacetoxyethylsilane
Recommended Use: Intermediate for silicone production, crosslinker for silicone sealants, water repellents
Manufacturer: Supplier details available on label or SDS request
Emergency Contact: Local poison control and emergency medical services contact info
GHS Classification: Skin Corrosion/Irritation: Category 2; Serious Eye Damage/Eye Irritation: Category 1
Signal Word: Danger
Hazard Statements: Causes skin and serious eye irritation, may cause respiratory irritation, harmful if inhaled, may cause damage to mucous membranes from hydrolysis product (acetic acid)
Pictograms: Corrosion, Exclamation Mark
Precautionary Statements: Wash thoroughly after handling, avoid breathing vapors, use only outdoors or in a well-ventilated area, wear protective gloves, eye/face protection, remove contaminated clothes and wash before reuse
Other Hazards: Contact with water or humidity yields acetic acid fumes which irritate skin and eyes, may intensify fire
Chemical Name: Triacetoxyethylsilane
Concentration: ≥98% (by weight)
Impurities: Acetic acid (trace amounts)
Hazard Components: Acetic acid released upon contact with moisture
Molecular Weight: 262.34 g/mol
Inhalation: Move person to fresh air right away, keep at rest half-sitting; provide oxygen if breathing is difficult; seek immediate medical attention if symptoms persist, such as cough, shortness of breath, or dizziness
Skin Contact: Rinse affected area thoroughly with running water for at least 15 minutes; remove contaminated clothing, launder before reuse; seek medical advice for persistent irritation or burns
Eye Contact: Rinse eyes cautiously with lukewarm water for at least 20 minutes, holding eyelids open; immediate medical attention strongly recommended
Ingestion: Rinse mouth; do not induce vomiting due to risk of chemical burns; seek medical attention without delay; never give anything by mouth to an unconscious person
Most Important Symptoms: Chemical burns, eye damage, mucous membrane irritation, difficulty breathing
Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide; do not use direct water jet on burning product
Specific Hazards: Thermal decomposition releases acetic acid vapors, possible silicon oxides, carbon oxides
Protective Equipment for Firefighters: Full chemical protection suit, self-contained breathing apparatus (SCBA)
Advice: Evacuate area, contain runoff, keep containers cool using water spray from a safe distance, avoid inhaling fumes
Personal Precautions: Evacuate unnecessary personnel; ventilate area thoroughly; avoid inhalation; prevent skin or eye contact; wear chemical-resistant suits, gloves, goggles, and mask
Environmental Precautions: Prevent further leakage or spillage if safe; avoid discharge to sewers, watercourses, or soil
Methods for Cleanup: Absorb with inert dry material like vermiculite, sand, or earth; flush remaining traces with water, absorbing runoff; collect in suitable, tightly sealed container; dispose according to local regulations
Decontamination: Wash area with large amounts of water; avoid generating aerosol or mist
Safe Handling: Ensure good ventilation/extraction; use only dry, dedicated equipment; transfer under local exhaust; avoid contact with water and humid air as hydrolysis forms acetic acid
Personal Hygiene: Do not eat, drink, or smoke during use; wash hands and exposed skin before breaks and after work
Storage Conditions: Store in tightly closed, original container in a cool, dry, well-ventilated location away from heat sources, direct sunlight, strong bases, acids, oxidizers, and moisture
Incompatible Materials: Avoid contact with water, alcohols, strong oxidizers, bases, acids
Exposure Limits: Acetic acid (by-product): OSHA PEL 10 ppm; ACGIH TLV 10 ppm, STEL 15 ppm
Engineering Controls: Work in well-ventilated area; use local exhaust ventilation; consider process enclosure
Eye/Face Protection: Chemical splash goggles and face shield
Skin Protection: Wear impervious gloves (nitrile, neoprene); full coverage clothing
Respiratory Protection: Use NIOSH-approved respirator for organic vapors, especially in poorly ventilated areas
General Hygiene Measures: Remove contami nated clothing, wash thoroughly before reuse, keep emergency eyewash and showers available nearby
Appearance: Clear, colorless to pale yellow liquid
Odor: Pungent, acetic acid-like
Odor Threshold: Not determined
pH: Not applicable (hydrolyzes in water)
Melting Point/Freezing Point: -55°C approx
Initial Boiling Point/Range: 141°C at 15 mmHg
Flash Point: 68°C (closed cup)
Evaporation Rate: Not determined
Flammability: Not classified as flammable; vapors may form explosive mixtures with air
Explosion Limits: Not determined
Vapor Pressure: 0.2 mmHg at 20°C
Vapor Density: Not available
Relative Density: 1.10 g/cm³ at 20°C
Solubility in Water: Reacts/hydrolyzes rapidly
Partition Coefficient n-octanol/water: Not available; likely low
Auto-ignition Temperature: Not available
Decomposition Temperature: Not established
Viscosity: 3.5 mPa·s at 25°C
Chemical Stability: Stable under dry, cool, inert conditions; decomposes with water or humid air
Possibility of Hazardous Reactions: Reacts with water, alcohols, acids, bases generating acetic acid
Conditions to Avoid: Moisture, humidity, direct sunlight, elevated temperatures, incompatible materials
Incompatible Materials: Strong bases, oxidizers, acids, water; products of hydrolysis (acetic acid) may corrode metals
Hazardous Decomposition Products: Acetic acid, silicon oxides, carbon oxides
Acute Toxicity: LD50 (oral, rat) 1780 mg/kg estimated; inhalation LC50 not precisely quantified; causes irritation via acetic acid release
Skin Corrosion/Irritation: Moderate to severe irritation, burns possible
Serious Eye Damage/Irritation: Severe; risk of irreversible damage from hydrolysis product
Respiratory Sensitization: Irritation of mucosa, nose, throat; coughing, shortness of breath
Ingestion Effects: Gastrointestinal irritation; nausea, vomiting, abdominal pain; corrosive burns to mouth, esophagus
Other Data: Not listed as carcinogen; symptoms appear rapidly after exposure
Chronic Effects: Prolonged or repeated exposure may worsen respiratory or skin conditions
Ecotoxicity: Acetic acid derivates can alter local pH; moderate toxicity to aquatic organisms
Persistence and Degradability: Hydrolyzes to acetic acid and silanols; acetic acid biodegrades readily in water and soil
Bioaccumulation: Not expected; low log Kow value for degradation products
Mobility in Soil: Degradation products migrate readily in moist environments
Other Information: Prevent entry into waterways, drains; possible local liberation of acetic acid
Waste Disposal: Treat as hazardous waste according to local, regional, and national rules
Contaminated Packaging: Empty containers carry product residue risks, need thorough triple rinsing before disposal or recycling
Disposal Methods: Send to licensed chemical disposal facility; uncontrolled incineration may release toxic gases
Precautions: Avoid discharge into environment, do not mix with household waste or pour down drains
UN Number: UN 1993 (when applicable—consult authorities for exact classification)
UN Proper Shipping Name: Flammable liquid, n.o.s. (Ethyltriacetoxysilane)
Transport Hazard Class: 3 (Flammable liquids)
Packing Group: III
Marine Pollutant: No
Special Precautions: Keep containers upright and tightly closed; do not transport with foodstuffs or oxidizers; comply with all packaging and labeling rules
IMDG/IATA Regulations: Observe all transport authority instructions for chemical substances
TSCA (USA): Listed
DSL (Canada): Listed
REACH (EU): Registered or exempt as import volume thresholds require
OSHA: Hazardous chemical, subject to standard workplace controls
Right-to-Know Lists: States such as California and New Jersey list acetic acid as a hazardous substance
Labeling Requirements: GHS-compliant label including hazard pictogram, precautionary statement, manufacturer info
Other International Regulations: Comply with relevant country and regional safety standards and chemical inventory requirements
